Malicious PDF — malware analysis report

Static analysis result for SHA-256 5322988b65886758…

MALICIOUS

PDF

95.1 KB Created: 2021-07-18 11:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 470295557916c4c9756efd869d694c7d SHA-1: 4f4fef94614cf7642d6f28ef6d9ba01aa96a2589 SHA-256: 5322988b65886758201310c09d45f68e2a3a5c7de2339e006df84f27c6b356b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites, some of which are hosted on disposable domains. This suggests a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/52ti400q46mopol855baepjt7q/94819335667.pdf In PDF document text
    • https://kopari.hu/files/file/bifojiminoseledujagusup.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4f44fe0d06171453dcd4c6862f4ad394/xidiwarokavuvis.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/rf66fo6921uugk6sgdfkp5vd97/degelubefafupabufedu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/39384001882.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c33e6cae---nuvekukadexikodizifafipov.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc47678924---98548584194.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fumalugeru.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/noxazipaxazabezekafu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dcb4ba4b73d6c4a0d77846820fb37d1/senedisalelofolikoramibu.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/lulirawikesujofizuk.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7f19dd16---vudaxawimirujapeginilolul.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b578d10695---24121524238.pdfIn PDF document text
    • https://noddy.nu/images/file/zatovobotebarobunimenik.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/63763945478.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d57a9d518---88622860593.pdfIn PDF document text
    • http://flirdining.com/uploads/files/nolodudafefoluge.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/pumaju.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/bofasenotufasoxepinovo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/55831565218.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/xiliwudobutuzezofubov.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/218dumonmu8phieju0vo7df3l3/77803448754.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bcc394b71b865d7612f633b44df6e671/mabuma.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v41v0vkch893m5asdcrvgjluu6/lelibeverotanivofipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=foods+high+in+hdlPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 17524 bytes
SHA-256: 9b34752882ffd3e1c9bf7dbacaa6bc186facb04585151510e453006b43e609cc
font_01_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 10012 bytes
SHA-256: fd8a4808f37588167b2ecc9aec70e590007a7175f5a41a088bf11bf7f905dd0c
font_02_sfnt_off00015755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1